Hoist especially suitable for raising projectiles on board ship



Feb 26 1924.

H. W. LEE ET AL HOIST ESPECIALLY SUITABLE FOR RAISING PROJECTILES ON BOARD SHIP Filed April 26. 1923 3 Sheets-Sheet 1 Plllllfl Il .hllll M s S W Y% R JRE TAIN TEWER N15 who W IHJB .llll lllll Feb. 26 1924.

H. W. LEE ET AL HOIST ESPECIALLY SUITABLE FOR RAISING PROJECTILES ON BOARD SHIP Filed April 26. 1923' H. w. LEE ET AL HOIST ESPECIALLY SUITABLE ,FOR RAISING PROJBCTILES ON BOARD SHIP Filed April 2a; 1923 :5 Shets-Sheet B H.W.LEE mmswngmw INVENI'ORS' BY THEIR- ATTYS,

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Patented Feb. 26, 1924.

UNITED STATES PATENT err-"ice.

HUGH WARREN LEE AND JOHN WINDLOW SWINDALE, OF NEVCASTLE-UPON-TYNE, ENG-LAND, ASSIGNOR-S TO SIR VT. G; ARDESTRONG, \UHITFVORTH AND-COIMEANY, LIMITED, 01? NEWCASTLE-UPON-TYNE, ENGLAND.

HOIST ESPECIALLY SUITABLE FOR RAISING FROJECTILES ON BOAR-D SHIP.

Application filed April 26, 1923.

To all whom it may concern:

Be it known that we, HUGH VVARREX LEE and Join: VINDLOW SWINDALE, subjects of the King of Great Britain, residing at Elswick Works, Newcastle-upon-Tyne, England, have invented a new and useful Improvement in Hoist-s Especially Suitable for Raising Projectiles on Board Ship, oi which the following is a specification.

This invention relates to hoists in which a load is raised by means of two sets of lifting arms carried by two bars which are raised and lowered alternately, the arms on each bar being turned into their operative position as that bar rises and being turned out of their operative position as the bar falls, so that theload is raised by an arm on one bar, then by an arm on the other bar, then by a second arm on the first bar, and so on.

According to'this invention the two bars are raised and lowered by two hydraulic rams working in two fixed cylinders and connected one to each bar, preferably by crossheads, and the two bars are coupled together by their being connected to an endless chain passing over two fixed sprocket wheels, so that the rise of one bar consequent on the admission of pressure water to its cylinder causes the descent of the other bar and the expulsion of the water from its cylinder. The admission of pressure water to the two cylinders alternately may be effected by a valve actuated by atappet on one of the bars. The arms are turned into and out of their operative positions by means of a cam plate which has in it slots in which move fingers or cams pivoted on the bars and which are so shaped that the fingers or cams are turned on their pivots at or near to the ends of the strokes of the bars. The cam plate may be provided with means whereby the normal motion of the arms may be reversed should it be desired to lower a load instead of raising it, that is whereby the arms may be put into their operative position when the bars are de scending instead of when the bars are rising.

The invention is illustrated by the accompanying drawings, in which Figure 1 is a Serial No. 834,714.

side elevation of the lower part of the mechanism and Figure 2 a side elevation of the upper part; Figures 3 and at are views at right angles to Figures 1 and 2. Figure 5 is a detail of the valve controlling the admission of water to the cylinders and of the means for actuating that valve. Figures 6 and T are detail views of the cam plates and fingers.

A, A", are two cylinders in which move rams B, E the ends of which are connected by cressheads (l, C to bars 1), D. The two crossheads are also connected to opposite sides of a chain E which passes over two lived sprocket wheels F, f. The lower end of each ram carries a piston G which fits watertight to its cylinder. Vater can be admitted to the bottoms of the cylinders by pipes H, H and to the top of each cylinder by pipes J, J these pipes leading from a valve chest K having in it a valve L. The valve rod Z is connected to two arms Z Z on fixed pivots, and the bar D carries a tappet (Z so arranged that when the bar D reaches the bottom of its stroke the tappet comes against the arm Z and turns itdownwards. thus bringing the valve L into the position shown in the drawing and admitting pres sure water to the bottom of cylinder A so that the bar I) will now be raised. As the bar D reaches its topmost position tappet (7 comes against arm Z and turns it up. thus reversing the valve L, putting pipes H, J to exhaust and admittingpressure to pipes J-and H, so that ram B will be raised and as it rises it will through the chain E cause the ram B to descend, this descending-moveinent being also assisted by the admission of pressure water through pipe J to the'annular space between the ram B and its cylinder. To each of the bars D, D, is pivoted a number of lifting arms M: each arm has on it a projection on engaged by arod N, the top end of which is connected by a link n to an-arm n "fast with three fingers pivoted to the lifting bars D, l). respectively. The lingers move in slots 0. formed in a cam late]? in guides 7) on which can'move two plates Q. R, actuated bv bell cranks g 2 connected. together by a link S. v

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Figure 6 shows the parts when lifting is taking place, that is, when the lifting arms M project as shown in Figure 3 into the trunk on each upward movement of the bar to which they are connected but are withdrawn from the trunk on the downward movement.

Consider the finger on the right hand bar D. The fingers T, T are in the plane of the slot 0 while the finger T is outside the slot. is the bar I) rises with the fingers in the positions shown in slot 0 in Figure 6, when the hai' reaches the top of its stroke, finger T comes against a projection Q on plate Q. and the lingers are thereby turned as seen in slot lhereupon the bar begins to descend and finger T comes against an incline in the side of the slot 0 nd the fingers are thereby still further turned as shown in slot 0 The rod N is thereby moved relatively to the bar D and the lifting arms lnt car ried by that bar are therefore turned on their, pivots and withdrawn from the trunk. hen the bar D reaches the bottom of its travel finger T comes against a projection R carried by plate and the fingers are thereupon turned in the opposite direction so that the lifting arms M are caused to project into the trunk.

Should it be desired to lower projectiles down the trunk the bell crank is moved counter-elockwise as seen in Figure 2 with the result that plates Q and R are moved to the left. Therefore the projections carried by plates Q and R leave the positions in which they are shown in Figure 6 and as: some the positions in. which they are shown in Figure 7, with the result that on bar D reaching its lower position its finger '1. comes against projection R and the fingers are thereby turned counterclockwise as seen in the bottom right hand corner of Figure 7. Similarly. when D arrives z t the bottom of its stroke its finger T will come against the left hand side of projection H and will sim ilarly be turned. 'llierefore during the as ccnding movement of either bar the lifting arms carried by it will be withdrawn from the trunk. As the bar I) nears the top of its stroke its finger T" will come against prw jection Q on plate Q so that the fingers will he turned clockwise into such a position that as. the bar continues to rise finger T enters recess 0'' whereupon the fingers are further turned clockwise until they assume a position corresponding to that of the fingers in slot 0 of Figure 7. It will be understood that owing to the movement of plate Q. its projections Q will have been moved out of their operative positions shown in Figure 6 intothe positions shown in Figure 7 in which thcv are out of the path of the fingers. The I'OFilf of the turning movement of the fins is to cause the lifting arms to protrude one the trunk so that they can support a projectile in their descent. When the bar reaches the bottom of its travel the fingers will be withdrawn as before described by the finger T striking the projection R or R as the case may be.

\Vhat we claim is 1. In a hoist, the combination of a pair of bars, lifting arms pivoted to each bar, a pair of hydraulic rains, one connected to each bar, two fixed sprocket wheels, a chain passing round the wheels and connected to the two bars and means for turning the arms on their pivots.

2. In a hoist, the conil'iii'iation of a pair of bars, lifting arms pivoted to each bar, a pair of hydraulic rains, one connected to each bar, two fixed sprocket wheels, a chain. passing round the wheels, and connected to the two l'nirs,n1eans for turning the arms on their pivots, a valve adapted to control the supply of liquid to the rams and means whereby one of the bars on arriving at the end of its travel in either direction reverses the valve.

3. In a hoist, the combination of a pair of bars, lifting arms pivoted to each bar, a pair of hydraulic rains, one connected to each bar, two fixed sprocket wheels, achain passing round the wheels and connected to the two bars and means for turning the arms on each bar into. their operative positions when that bar is rising and into their inoperative positions when that bar is de sceiiding.

st. in a hoist, the combinationof a pair of bars, lifting arms pivoted to each bar, a pair of hydraulic rams, one ctninected to each bar, two fixed sprocket wheels, a. chain passing round the wheels and coiniccted to the two bars. means for turning the arms on each. bar into their operative positions when that bar is rising and into their inoperative positions when that bar is descending ainlnieans for reversing the positions ofthe arms.

In ahoist, the combination of a pair of bars, a pair of hydraulic rams, one connected to each bar, two fixed sprocket wheels, a chain passing round the wheels and connected to the two bars, lifting arms pivoted to each bar. a rod connecting the arms of each bar, fingers pivoted to the bars, a cam plate adapted to turn the fingers on their bars and means wl'iereby the turning of the fingers on, either bar moves the rod relatively to the bar.

6. In a hoist, the combination of a pail-of bars, means for moving them up and; down alternately, lifting arms pivoted to each bar. a rod connecting the arms of each bar, fingers pivoted to. each bar and connected to the rod thereof and a cam plate adapted to turn the fingers of each bar n ,ar the end of the travel thereof and so to move the rod of that bar relatively to that bar.

7. In a hoist. the combination of a pair of bars. means for moving them up and down alternately, lifting arms pivoted to each by the normal movements of each rod relabar, a rod connecting the arms of each bar, tive to its bar can be reversed. fingers pivoted to each bar and connected to In testimony that we claim the forego- 10 the rod thereof, a cam plate adapted to turn ing as our invention We have signed our 5 the fingers of each bar near the end of the names this 26th day of March 1923. travel thereof and so to move the rod of that "HUGH WARREN LEE. bar relatively to that bar and means Where- JOHN VINDLOVV SVVINDALE. 

